Quit Tinder - it is arguably the worst method of finding a potential partner. It is only ever used for meaningless hook-ups and ego boosting. Its also worth noting one of the many tactics Tinder uses is to intentionally ignore your swipes if you swipe several to the right - remember that Tinder only benefit from you if you are single so they can spy on your intimate messages, interests, etc...
Find a hobby
If you have a hobby then you are good to go already. Find a group that shares the same hobby as you and focus on that hobby and meeting friends via that hobby. Build your confidence via this and start introducing yourself to people sharing similar interests. Self-esteem is key to attracting a potential partner. Physical appearance changes overtime and a majority of it can be naturally adaptable if given the right techniques, such as exercising, healthy eating, sunlight, etc...
If you want a partner, then you need to actively work on being the best you that you can be. A majority of the physical stuff will not matter when in a relationship as long as you have a good personality, having the confidence to chat with a potential partner and making them laugh and smile goes more than anything else.
The cosmetic surgery idea is insanity, expensive and you will feel even more insecure if you were to do so. Avoid it.